Force-load a lazy background page whenever an extension is enabled.

chrome/browser/extensions/api/app_runtime/app_runtime_api.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/api/app_runtime/app_runtime_api.h"
 
 #include "base/json/json_writer.h"
 #include "base/string16.h"
 #include "base/string_number_conversions.h"
 #include "base/utf_string_conversions.h"
@@ skipping 12 matching lines @@
 
 const char kIntentIdKey[] = "intentId";
 const char kIntentSuccessKey[] = "success";
 const char kIntentDataKey[] = "data";
 const char kOnLaunchedEvent[] = "app.runtime.onLaunched";
 const char kOnRestartedEvent[] = "app.runtime.onRestarted";
 
 const char kCallbackNotFoundError[] =
     "WebIntent callback not found; perhaps already responded to";
 
+void DispatchOnLaunchedEventImpl(const std::string& extension_id,
+                                 scoped_ptr<base::ListValue> args,
+                                 Profile* profile) {
+  extensions::ExtensionSystem* system =
+      extensions::ExtensionSystem::Get(profile);
+  // Special case: normally, extensions add their own lazy event listeners.
+  // However, since the extension might have just been enabled, it hasn't had a
+  // chance to register for events. So we register on its behalf. If the
+  // extension does not actually have a listener, the event will just be
+  // ignored (but an app that doesn't listen for the onLaunched event doesn't
+  // make sense anyway).
+  system->event_router()->AddLazyEventListener(kOnLaunchedEvent, extension_id);
+  system->event_router()->DispatchEventToExtension(
+      extension_id, kOnLaunchedEvent, args.Pass(), profile, GURL());
+  system->event_router()->RemoveLazyEventListener(kOnLaunchedEvent,
+                                                  extension_id);
+}
+
 }  // anonymous namespace
 
 namespace extensions {
 
 // static.
 void AppEventRouter::DispatchOnLaunchedEvent(
     Profile* profile, const Extension* extension) {
   scoped_ptr<ListValue> arguments(new ListValue());
-  extensions::ExtensionSystem::Get(profile)->event_router()->
-      DispatchEventToExtension(extension->id(), kOnLaunchedEvent,
-                               arguments.Pass(), profile, GURL());
+  DispatchOnLaunchedEventImpl(extension->id(), arguments.Pass(), profile);
 }
 
 // static.
 void AppEventRouter::DispatchOnRestartedEvent(
     Profile* profile, const Extension* extension) {
   scoped_ptr<ListValue> arguments(new ListValue());
   extensions::ExtensionSystem::Get(profile)->event_router()->
       DispatchEventToExtension(extension->id(), kOnRestartedEvent,
                                arguments.Pass(), profile, GURL());
 }
 
 // static.
 void AppEventRouter::DispatchOnLaunchedEventWithFileEntry(
     Profile* profile, const Extension* extension, const string16& action,
     const std::string& handler_id, const std::string& mime_type,
     const std::string& file_system_id, const std::string& base_name) {
   scoped_ptr<ListValue> args(new ListValue());
   DictionaryValue* launch_data = new DictionaryValue();
   launch_data->SetString("id", handler_id);
   DictionaryValue* launch_item = new DictionaryValue;
   launch_item->SetString("fileSystemId", file_system_id);
   launch_item->SetString("baseName", base_name);
   launch_item->SetString("mimeType", mime_type);
   ListValue* items = new ListValue;
   items->Append(launch_item);
   launch_data->Set("items", items);
   args->Append(launch_data);
-  extensions::ExtensionSystem::Get(profile)->event_router()->
-      DispatchEventToExtension(extension->id(), kOnLaunchedEvent, args.Pass(),
-                               profile, GURL());
+  DispatchOnLaunchedEventImpl(extension->id(), args.Pass(), profile);
 }
 
 // static.
 void AppEventRouter::DispatchOnLaunchedEventWithWebIntent(
     Profile* profile, const Extension* extension,
     content::WebIntentsDispatcher* intents_dispatcher,
     content::WebContents* source) {
   webkit_glue::WebIntentData web_intent_data = intents_dispatcher->GetIntent();
   scoped_ptr<ListValue> args(new ListValue());
   DictionaryValue* launch_data = new DictionaryValue();
@@ skipping 35 matching lines @@
       break;
     default:
       NOTREACHED();
       break;
   }
   DCHECK(args->GetSize() == 2);  // intent_id must be our third argument.
   WebIntentCallbacks* callbacks = WebIntentCallbacks::Get(profile);
   int intent_id =
       callbacks->RegisterCallback(extension, intents_dispatcher, source);
   args->Append(base::Value::CreateIntegerValue(intent_id));
-  extensions::ExtensionSystem::Get(profile)->event_router()->
-      DispatchEventToExtension(extension->id(), kOnLaunchedEvent, args.Pass(),
-                               profile, GURL());
+  DispatchOnLaunchedEventImpl(extension->id(), args.Pass(), profile);
 }
 
 bool AppRuntimePostIntentResponseFunction::RunImpl() {
   DictionaryValue* details = NULL;
   EXTENSION_FUNCTION_VALIDATE(args_->GetDictionary(0, &details));
 
   int intent_id = 0;
   EXTENSION_FUNCTION_VALIDATE(details->GetInteger(kIntentIdKey, &intent_id));
 
   WebIntentCallbacks* callbacks = WebIntentCallbacks::Get(profile());
@@ skipping 12 matching lines @@
     reply_type = webkit_glue::WEB_INTENT_REPLY_SUCCESS;
 
   std::string data;
   EXTENSION_FUNCTION_VALIDATE(details->GetString(kIntentDataKey, &data));
 
   intents_dispatcher->SendReplyMessage(reply_type, UTF8ToUTF16(data));
   return true;
 }
 
 }  // namespace extensions